“Johnny, why didn’t you brush …

“Johnny, why didn’t you brush your teeth before leaving for school!”, the teacher admonished Little Johnny, “I can see through your teeth what you ate for breakfast.”
“Guess what I ate this morning!”
“Egg”, the teacher replied.”Look, there is something stuck in your teeth and it looks like egg”.
“Oh yeah,” Little Johnny said,” well you’re wrong. I had eggs yesterday!”